PHP Array Exercises : Generate unique random numbers within a range

Last update on May 30 2025 13:14:07 (UTC/GMT +8 hours)

15. Generate Unique Random Numbers within a Range

Write a PHP script to generate unique random numbers within a range.

Sample Range : (11, 20)

Sample Solution:

PHP Code:

<?php
// Generate an array containing numbers from 11 to 20 using 'range'
$n = range(11, 20);

// Shuffle the elements of the array using 'shuffle'
shuffle($n);

// Use a 'for' loop to iterate 10 times
for ($x = 0; $x < 10; $x++)
{
    // Echo the current element of the shuffled array followed by a space
    echo $n[$x] . ' ';
}

// Echo a newline character for better formatting
echo "\n";

?>

Output:

17 19 13 15 20 14 12 18 11 16

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to generate a shuffled list of unique random numbers between a given range and display them in sorted order.
Write a PHP function to create an array of unique random integers within a specified range using a loop and validation.
Write a PHP program to generate unique random numbers between 11 and 20 and check for duplicates before final output.
Write a PHP script to simulate a lottery drawing by generating and printing a set of unique random numbers from a given range.

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